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<br />CONTENTS-Continued <br /> <br />Page <br /> <br />Dissolved oxygen (D.O.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 <br /> <br />~.............................................................. W <br />Conductivity ...................................................... 20 <br />Oxidation-reduction potential (Eh) ..................................... 20 <br /> <br />Current. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 <br />Substrate ......................................................... 21 <br />Water chemistry. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 <br />Heavy metals ...................................................... 21 <br />Aquatic macroinvertebrates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 <br />Fish ............................................................. 22 <br /> <br />Discussion .......................................................... 33 <br />Temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 <br />Dissolved oxygen (D.O.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 <br />~.............................................................. ~ <br />Conductivity ...................................................... 33 <br />Oxidation-reduction potential (Eh) ..................................... 33 <br />Cu rrent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 <br />Su bstrate ......................................................... 34 <br />Water chemistry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 <br /> <br />Heavy metals ...................................................... 36 <br />Aquatic macroinvertebrates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 <br /> <br />Fish ............................................................. 39 <br /> <br />Appendix <br /> <br />Bibliography. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 <br /> <br />TABLES <br /> <br />1 <br />2 <br /> <br />Range of field measurements at all stations ......................... <br />Range, mean, and standard deviation of chemical concentrations <br />at all stations .............................................. <br />Range of additional phosphorus and nitrogen concentrations <br /> <br />at all stations .............................................. <br />Type and abundance of aquatic macrofauna collected at <br />each station from April through November 1979 . . . . . . . . . . . . . . . . . . . <br />Type and abundance of aquatic macrofauna collected at <br />selected stations from April through September 1980 . . . . . . . . . . . . . . . <br />Trout population estimates at selected river stations <br />obtained by electrofishing on October 2. 1979 .................... <br /> <br />3 <br /> <br />4 <br /> <br />5 <br /> <br />6 <br /> <br />FIGURES <br /> <br />1 <br />2 <br />3 <br />4 <br /> <br />Location of study area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <br />Map of upper portion of Fryingpan-Arkansas Project. . . . . . . . . . . . . . . . . . <br />Map of the upper Arkansas River study area and sampling stations ....... <br />Hydrolab Corporation Surveyor mu Itiparameter probe ................ <br /> <br />iv <br /> <br />49 <br /> <br />21 <br /> <br />22 <br /> <br />24 <br /> <br />24 <br /> <br />25 <br /> <br />25 <br /> <br />1 <br />2 <br />3 <br />17 <br />